Arguing with S/O

I just need to rant. I have been with my so 5 years and we are getting married on 1/26. Lately we have been arguing alot and I hate it. I get that I am extra sensitive but I just feel like he could be more sensitive to me. Most of the time he is but lately he seems less willing to try. I am 6+2, 3rd child and his first. My kids father was a raging alcoholic and he was abusive with me when I was pregnant so I already know that I am in a way better place. I need to remember where I came from and be grateful for what I have but shit he pisses me off! I don't really know what I am trying to say here lol. I'm just irritated and I am tired of arguing. I just want to be happy and pregnant !